Qualified Education Worksheet

What amount is it showing? 

There is a limit of 10,000 per student.

Line 18 - Used for exclusion is 14,060.  Line 1 Tuition paid is 19,790.  My question is where does the line 18 amount come from or how is it calculated?

The amount on line 18 would be the education expenses used for purposes of qualifying for an education credit or tuition and fees deduction. You can't use the same expenses to exclude income on your education plan that you used to receive an education expense credit or deduction.